A propeller speed governor beta valve assembly

Abstract

The present invention discloses a propeller speed regulator beta valve assembly, wherein a small-pitch end plug is provided at one end of the valve, and a U-shaped fork is fixed at the other end; a bushing is fixed in the inner hole of a circular mounting opening protruding from a speed regulator housing by interference fit; a micro-clearance of one end of the valve with the small-pitch end plug is assembled in the bushing; a return spring sleeved on the valve and fixed in the U-shaped fork groove is crimped on the adjusting washer; a cap is sleeved on the U-shaped fork, the adjusting washer and the outer circle of the circular mounting opening and fixed on the circular mounting opening; an oil groove is provided on the valve, and the bushing is provided with a high-pressure oil outlet and inlet connected to the oil groove, and the inner cavity of the bushing at the end of the small-pitch end plug is an oil return cavity; under normal working conditions, the high-pressure oil outlet is connected to the oil groove, and when the small-pitch limit is applied, the small-pitch end plug just closes the high-pressure oil outlet. The propeller speed regulator installed with the present invention has the function of small-pitch limit fixed-distance protection, and has the functions of β control and reverse propeller, so that the propeller structure becomes simple, the volume becomes smaller, and the weight becomes lighter.

Description

Technical Field

[0001] The invention relates to a beta valve assembly of a propeller speed governor. Background Art

[0002] The existing propeller speed governor does not have a small pitch limit mechanism. The propeller adopts an end face gear meshing mechanism for fixed pitch protection. The end face gear meshing mechanism has a complex structure, which increases the volume and weight of the propeller and can no longer meet the use requirements of some aircraft such as aircraft. It is urgent to study a propeller speed governor with a small pitch limit fixed pitch protection function. In addition, the existing speed governor does not have β control and reverse propeller functions. The aircraft landing and taxiing relies on methods such as reducing the propeller blade angle within a certain range to achieve a certain damping effect, but the effect is minimal. The aircraft landing and taxiing distance is long, and a long runway needs to be set up, which wastes land resources and makes the existing land resources low in utilization rate. Therefore, it is also urgent to study a speed governor with a simple oil circuit, which can control the feathering and realize β control and reverse propeller functions. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art and to provide a propeller speed governor beta valve assembly. The propeller speed governor equipped with the beta valve assembly has a small pitch limit and fixed pitch protection function, β control and reverse propeller functions, so that the propeller structure becomes simple, the volume becomes smaller, the weight becomes lighter, the flight safety is good, and the taxiing runway is shortened.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is: a propeller governor beta valve assembly, including a bushing, a valve, a return spring, a U-shaped fork with a step and a center hole, and a cap; a small-pitch end plug is provided at one end of the valve, and a U-shaped fork is fixed at the other end; the bushing is press-fitted into a circular mounting opening protruding from the governor housing, and an adjusting gasket with the same diameter as the circular mounting opening protruding from the governor housing is press-fitted on the port by the cap, and the relative position of the small-pitch end plug of the valve and the high-pressure oil outlet of the bushing is adjusted by adjusting the gasket; a micro-gap at one end of the valve with the small-pitch end plug is assembled in the bushing, and a sealing ring is sealed between the valve and the bushing at the end of the bushing; a sealing ring is sleeved on the valve and fixed in the U-shaped fork groove The return spring inside is crimped on the adjusting washer; the cap has a variable diameter inner hole whose diameter matches the outer circle of the U-shaped fork and the outer circle of the U-shaped fork step, the adjusting washer and the outer circle of the circular mounting port, and it is sleeved on the U-shaped fork, the adjusting washer and the outer circle of the circular mounting port and fixed on the circular mounting port, and the length of the inner hole part matching the outer circle of the U-shaped fork step is the maximum range of the valve movement; an oil groove is provided on the valve, and the bushing is provided with a high-pressure oil outlet and a high-pressure oil inlet connected to the oil groove, and the inner cavity of the bushing at the end of the small-pitch end plug is an oil return cavity; under normal working conditions, the high-pressure oil outlet is connected to the oil groove, and when the small-pitch limit is applied, the valve moves to the outer end of the circular mounting port and the small-pitch end plug just closes the high-pressure oil outlet.

[0005] Further preferably, there is a plastic gasket embedded on the inner wall of the cap port between the cap and the U-shaped fork to seal and prevent dust.

[0006] Further preferably, another sealing ring is pressed between the bushing, the circular mounting opening and the adjusting washer.

[0007] When in use, the oil return chamber is directly connected to the oil return hole in the governor housing, and the high-pressure oil outlet and the high-pressure oil inlet are respectively connected to the high-pressure oil inlet of the governor speed selection mechanism and the gear pump high-pressure oil outlet through the high-pressure oil holes in the housing. The outer end of the U-shaped fork is connected to the reverse propeller lever, and the reverse propeller lever is connected to the power rod and the propeller.

[0008] When the engine is slow, the high-pressure oil pumped out by the governor enters the propeller cavity, and the propeller moves from the feathering direction to the small pitch direction. When the propeller blade angle decreases to an angle of α, the propeller continues to decrease in pitch. The beta valve moves under the elastic force of the reverse propeller lever and the return spring, and the small pitch end plug on the beta valve closes the high-pressure oil outlet, so that the propeller blade angle is automatically maintained at a certain blade angle, so that the propeller is pitched and the protection function is achieved. β control and reverse propeller: When the reverse propeller is operated, the propeller moves in the reverse propeller direction, the reverse propeller lever drives the beta valve to move forward, the small pitch end plug closes the high-pressure oil outlet, and no longer supplies oil to the propeller cavity, so that it automatically maintains a certain blade angle. Continue to pull the power lever back to reverse the propeller, the beta valve moves backward again, the small pitch end plug leaves the high-pressure oil outlet, and supplies oil to the propeller cavity. The high-pressure oil enters the propeller cavity again, causing it to move in the reverse propeller direction. The reverse propeller lever drives the beta valve to move forward, and the oil circuit is closed again. This process is repeated until full reverse propeller is achieved.

[0009] The propeller speed governor equipped with the beta valve assembly of the present invention has a small pitch limit fixed pitch protection function, a beta control and a reverse propeller function, so that the propeller structure becomes simple, the volume becomes small, the weight becomes light, the flight safety is good, and the taxiing runway is shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the installation structure of the present invention;

[0011] Figure 2 It is a schematic diagram of the structure of the valve in the present invention. DETAILED DESCRIPTION

[0012] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0013] like Figure 1 and Figure 2As shown, this embodiment includes a bushing 5, a valve 8, a return spring 10, a U-shaped fork 9 with a step and a center hole, and a cap 13. A small pitch end plug 15 is provided at one end of the valve 8, and a U-shaped fork 9 is fixed at the other end. The bushing 5 is press-fitted into the circular mounting opening 14 protruding from the speed regulator housing, and an adjustment gasket 12 with the same diameter as the circular mounting opening 14 protruding from the speed regulator housing is press-fitted on the port by the cap 13; the relative position of the small pitch end plug 15 of the valve and the high-pressure oil outlet 2 of the bushing is adjusted by adjusting the gasket 12. The end of the small pitch end plug 15 of the valve 8 is assembled in the bushing 5 with a slight gap, and the valve 8 and the bushing 5 are sealed by a sealing ring 6 at the end position of the bushing 5. Another sealing ring 7 is press-fitted between the bushing, the circular mounting opening 14 and the adjusting gasket 12. The return spring 10, which is sleeved on the valve 8 and fixed in the groove of the U-shaped fork 9, is crimped on the adjusting gasket 12. The cap 13 has a variable diameter inner hole whose diameter matches the outer circle of the U-shaped fork 9 and the outer circle of the U-shaped fork step 16, the adjusting washer 12 and the outer circle of the circular installation port 14. It is sleeved on the U-shaped fork 9, the adjusting washer 12 and the outer circle of the circular installation port 14 and is threadedly fixed on the circular installation port 14. The length of the inner hole part matching the outer circle of the U-shaped fork step 16 is the maximum range of the valve 8. Preferably, there is a plastic gasket 11 embedded on the inner wall of the cap 13 port between the cap 13 and the U-shaped fork 9 to seal and prevent dust. The valve 8 is provided with an oil groove 3, and the bushing 5 is provided with a high-pressure oil outlet 2 and a high-pressure oil inlet 4 connected to the oil groove 3. The inner cavity of the bushing 5 at the end of the small pitch end plug 15 is an oil return cavity 1. Under normal working conditions, the high-pressure oil outlet 2 is connected to the oil groove 3. When the small pitch is limited, the valve 8 moves to the outer end of the circular installation port 14, and the small pitch end plug 15 just closes the high-pressure oil outlet 2. When in use, the oil return chamber 1 is directly connected to the oil return hole 17 in the governor housing, and the high-pressure oil outlet 2 and the high-pressure oil inlet 4 are respectively connected to the high-pressure oil inlet of the governor speed selection mechanism and the gear pump high-pressure oil outlet through the high-pressure oil holes in the housing, and the outer end of the U-shaped fork is connected to the reverse propeller lever, and the reverse propeller lever is connected to the power rod and the propeller.

[0014] Of course, the present invention has many other embodiments. Without violating the spirit and essence of the present invention, technicians familiar with the field can make corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should be regarded as improvements of equivalent technologies and belong to the protection scope of the claims of the present invention.

Claims

1. A propeller speed governor beta valve assembly, Features: It includes a bushing, a valve, a return spring, a U-shaped fork with a step and a center hole, and a cap; a small-pitch end plug is provided at one end of the valve, and a U-shaped fork is fixed at the other end; the bushing is press-fitted into the circular mounting opening protruding from the speed regulator housing, and an adjustment gasket with the same diameter as the circular mounting opening protruding from the speed regulator housing is press-fitted into the port by the cap; a micro-gap is assembled in the bushing at one end of the valve with the small-pitch end plug, and a sealing ring is sealed between the valve and the bushing at the end of the bushing; a return spring sleeved on the valve and fixed in the U-shaped fork groove is pressed onto the adjustment gasket; the cap has a diameter equal to the outer circle of the U-shaped fork and the step of the U-shaped fork The variable diameter inner hole matches the outer circle, adjusting washer and the outer circle of the circular mounting port, which is sleeved on the U-shaped fork, adjusting washer and the outer circle of the circular mounting port and fixed on the circular mounting port, and the length of the inner hole part matching the outer circle of the U-shaped fork step is the maximum range of the valve movement; the valve is provided with an oil groove, and the bushing is provided with a high-pressure oil outlet and a high-pressure oil inlet connected to the oil groove, and the bushing inner cavity at the end of the small-pitch end plug is an oil return cavity; under normal working conditions, the high-pressure oil outlet is connected to the oil groove, and when the small-pitch limit is applied, the valve moves to the outer end of the circular mounting port and the small-pitch end plug just closes the high-pressure oil outlet.

2. The propeller speed governor beta valve assembly according to claim 1, Features: A plastic gasket is arranged between the cap and the U-shaped fork and is embedded on the inner wall of the cap port.

3. The propeller speed governor beta valve assembly according to claim 1 or 2, Features: Another sealing ring is pressed between the bushing, the circular mounting opening and the adjusting washer.

Images